EP 2453448 A1 20120516 - NDFEB SINTERED MAGNET, AND PROCESS FOR PRODUCTION THEREOF
Title (en)
NDFEB SINTERED MAGNET, AND PROCESS FOR PRODUCTION THEREOF
Title (de)
NDFEB-SINTERMAGNET UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
AIMANT NDFEB FRITTÉ ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- JP 2010061712 W 20100709
- JP 2009164276 A 20090710
Abstract (en)
Disclosed is a sintered NdFeB magnet having high coercivity (H cJ ) a high maximum energy product ((BH) max ) and a high squareness ratio (SQ) even when the sintered magnet has a thickness of 5 mm or more. The sintered NdFeB magnet is produced by diffusing Dy and/or Tb in grain boundaries in a base material of the sintered NdFeB magnet by a grain boundary diffusion process. The sintered NdFeB magnet is characterized in that the amount of rare earth in a metallic state in the base material is between 12.7 and 16.0% in atomic ratio, a rare earth-rich phase continues from the surface of the base material to a depth of 2.5 mm from the surface at the grain boundaries of the base material, and the grain boundaries in which R H has been diffused by the grain boundary diffusion process reach a depth of 2.5 mm from the surface.
IPC 8 full level
H01F 1/053 (2006.01); B22F 1/17 (2022.01); C22C 38/00 (2006.01); H01F 1/057 (2006.01); H01F 1/08 (2006.01); H01F 41/02 (2006.01)
CPC (source: CN EP US)
B22D 11/001 (2013.01 - EP US); B22F 1/17 (2022.01 - CN EP US); B22F 3/1017 (2013.01 - US); B22F 3/24 (2013.01 - US); B22F 9/04 (2013.01 - US); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/004 (2013.01 - EP US); C22C 38/005 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/10 (2013.01 - EP US); C22C 38/16 (2013.01 - EP US); C23C 10/30 (2013.01 - US); C23C 12/02 (2013.01 - US); H01F 1/053 (2013.01 - US); H01F 1/0571 (2013.01 - EP US); H01F 1/0577 (2013.01 - CN); H01F 1/086 (2013.01 - US); H01F 7/02 (2013.01 - CN EP US); H01F 41/0293 (2013.01 - CN EP US); B22F 2003/241 (2013.01 - US); B22F 2003/248 (2013.01 - US); B22F 2009/044 (2013.01 - US); B22F 2201/20 (2013.01 - US); B22F 2202/05 (2013.01 - US); B22F 2301/355 (2013.01 - US); B22F 2998/10 (2013.01 - US); H01F 1/0577 (2013.01 - EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
DOCDB simple family (publication)
EP 2453448 A1 20120516; EP 2453448 A4 20140806; CN 102483979 A 20120530; CN 102483979 B 20160608; CN 106098281 A 20161109; CN 106098281 B 20190222; JP 2015122517 A 20150702; JP 5687621 B2 20150318; JP 6005768 B2 20161012; JP WO2011004894 A1 20121220; US 2012176211 A1 20120712; US 2017103851 A1 20170413; US 9589714 B2 20170307; WO 2011004894 A1 20110113
DOCDB simple family (application)
EP 10797205 A 20100709; CN 201080030500 A 20100709; CN 201610370890 A 20100709; JP 2010061712 W 20100709; JP 2011521979 A 20100709; JP 2015010195 A 20150122; US 201013383034 A 20100709; US 201615383509 A 20161219